mingw: fix mingw_open_append to work with named pipes

diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index cb4b66e29dd8c38c734f5d29df3e8062c78884a9..91fd71444dbe40400b6608b56d51ae72e8ceafbc 100755 (executable)
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -713,7 +713,7 @@ test_expect_success 'fsck notices dangling objects' '
 
 test_expect_success 'fsck $name notices bogus $name' '
        test_must_fail git fsck bogus &&
-       test_must_fail git fsck $_z40
+       test_must_fail git fsck $ZERO_OID
 '
 
 test_expect_success 'bogus head does not fallback to all heads' '
@@ -723,7 +723,7 @@ test_expect_success 'bogus head does not fallback to all heads' '
        blob=$(git rev-parse :foo) &&
        test_when_finished "git rm --cached foo" &&
        remove_object $blob &&
-       test_must_fail git fsck $_z40 >out 2>&1 &&
+       test_must_fail git fsck $ZERO_OID >out 2>&1 &&
        ! grep $blob out
 '